. >>> president obama and mitt romney are going through final preparations for the debate tomorrow. the president is preparing in nevada. you can watch the debate here tomorrow. our coverage begins at 6:00 p.m. and will be followed by a special edition of the news. >>> while president obama and governor romney are debating -- are going through debate preps, the running mates are out stomping for votes. vice president joe biden is campaigning today in north carolina. he's criticizing mitt romney for opposing policies that biden says would cut taxes for millionaires and race -- and raise them for for middle-class families. >> how they can justify this? raising taxes for the middle class that's been buried. how can they justify raising those taxes. >> ♪ >> the republican campaign has repeatedly said claims about romney's tax plan are falls. >> we have offered very specific progrowth solutions to get our economy in gear. we can have a dynamic progrowth economy that fosters independence and opportunity verses a stagnant economy that fosters dependency. >> paul ryan is stomping in iowa